The denier is the basic unit of currency in Millénaire, and is exchanged in every situation of trade. Denier are represented as a d on the trading screens.

Denier stack up to 64, upon which they become a Denier Argent, represented as an a, and in turn, 64 Denier Argents translate into a Denier Or, represented as an o and is the highest unit of currency.

If you have multiple stacks of 64 Denier or Denier Argent, place them in your inventory and make another trade with the villagers. All your stacks will be automatically upgraded to the next highest tier of denier.